General

Engineer's Note

This Samsung DDR3-1866 RDIMM is purpose-built for server platforms, delivering the data integrity essential for virtualization, in-memory databases, and critical enterprise workloads through its ECC and registered signal architecture. The single-rank x8 configuration reduces bus loading to enable stable, high-density memory populations, while the CL13 latency ensures responsive performance under sustained multi-threaded access.

Technical Specs & Insights

1. ECC error correcting capability prevents silent data corruption, ensuring operational reliability for mission-critical server applications that cannot tolerate unplanned downtime.
2. Registered signal architecture strengthens signal integrity across high-density memory configurations, enabling seamless scaling of virtualized workloads without compromising stability.
3. 1866MHz memory speed delivers the low-latency bandwidth necessary to accelerate in-memory databases and real-time analytics engines under sustained load.
4. CL13 column access latency minimizes data retrieval delays, directly benefiting transactional applications where microsecond responsiveness translates to measurable business revenue.
5. Single Rank x8 organization reduces power draw per module and improves thermal consistency, a subtle advantage when deploying fleets of servers in tightly packed rack environments.

Why These Specs Matter

The Samsung M393B5173BH0-CMA is a server-grade DDR3 Registered DIMM purpose-built for data centers where uptime and precision are absolute. In a virtualization cluster hosting dozens of VMs, a single undetected memory bit flip can silently corrupt hypervisor data and crash critical workloads. The module’s ECC error correction continuously detects and repairs these single-bit errors, preserving transactional integrity across your entire virtualized stack and preventing costly, unexplained outages. Its Registered buffer decouples the DRAM from the memory controller, allowing you to populate all channels with multiple 4 GB modules without signal degradation; this is essential for scaling to high total RAM in multi-socket servers without sacrificing stability. The 1866 MHz frequency paired with a tight CAS 13 latency delivers PC3-14900 bandwidth that directly accelerates in-memory databases like Redis or Memcached, where sub-millisecond session and cache lookups translate into real revenue. The single-rank x8 configuration further lowers electrical loading, sustaining stable high-speed operation even in dense configurations. Whether you are consolidating virtualized application servers or running a real-time analytics engine, this RDIMM combines data integrity, scalable capacity headroom, and predictable low latency that enterprise workloads demand.

Endurance & Reliability

Capacity Planning with Samsung M393B5173BH0-CMA (4GB DDR3-1866 RDIMM)

General Virtualization
Populate each memory channel with at least one 4GB RDIMM to preserve full 1866MT/s bandwidth, then add a second module per channel if capacity expansion is needed without sacrificing too much speed. A typical dual-socket server using 16 to 24 modules (64–96 GB total) comfortably supports mixed VM workloads. Symmetric population across CPU sockets ensures balanced NUMA performance and stable virtual machine failover.

In-Memory Database
Maximize capacity by filling every available DIMM slot with these 4 GB RDIMMs; for a 24-slot system this yields 96 GB of error-correcting memory suitable for medium-sized datasets. Configure identical ranks in mirrored or lockstep mode if hardware resilience is critical. Because single-module capacity is limited, plan to deploy multiple nodes in a scale-out cluster to handle larger in-memory working sets while keeping latency predictable.

High Performance Computing
For bandwidth-bound HPC applications, install one module per channel (1DPC) to sustain the full 1866MT/s data rate, achieving the lowest transfer latency across all channels. If node-level memory capacity must be increased, move to two modules per channel but accept a speed reduction to 1600MT/s or lower; evaluate whether adding more nodes is a more efficient way to meet total memory demands. Balance per-node configuration to avoid bandwidth saturation before scaling horizontally.

Verified Compatibility

Rigorously tested, compatible with servers like Dell PowerEdge R720, HPE ProLiant DL380p Gen8, Lenovo System x3650 M4.

FAQ